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Someone please explain this startup idle. It starts fine and climbs to 1500 or so. After a second or two, it climbs farther to over 2000, why? and then slowly lowers to its resting idle. This seems like a vacuum leak to me but I have smoke tested, brake cleaner tested. Changed intakes, changed TBs and got a new IAC .
This is a cold start but it does is while warm as well although jumps to 3000 before returning to normal idle. The only other thing I can see it a tune issue. Other than this start up idle, it runs fine.
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Someone explain this startup idle 
